Bit holder and extender.



PATENTED AUG. 6, 1907.

E. T. MURRAY.

BIT HOLDER AND BXTENDERN APPLICATION FILED FEB.17. 1905.

OFFTCEQ EDWARD T. MURRAY, OF COLORADO SPRINGS, COLORADO.

BIT HOLDER AND EXTENDER.

Specification of Letters Patent.

Patented Aug. 6, 1907.

Application filed February 17, 1905. Serial- No. 246,1 '72.

To all whom it may concern:

Be it known that I, EIHVA en T. lllURRAfi', a citizen of the United States, residing at Colorado Springs, in the county of El Paso and State of Colorado, have invented new and useful Improvements in Bit Holders and Extenders, of which the following is a specification.

This invention relates to a bit holder and extender, namely, a device whereby bits may be attached to and projected forward from a brace to permit a short bit to be used for operations ordinarily requiring long bits, the objectot the invention being to provide a device of this char: .ter which may be readily packed with other tools in a tool bagor chest, which is simple of construction and admits of the convenient application and removal of the bit, and which is ofjsuch restricted crosssectional' size or diameter as toeasily iollow the bit into the bore, thereby enabling deep holes to be bored with an ordinary short; bit.

With this and other objects in view, theinvention consists of the features of construction, combination and arrangement of parts hereinafter fully described I and claimed, reference being had to the accompanying drawings, in which 1+ Figure 1 is a view in elevation of a bit holder and extender embodying my invention; Fig. 2 is avertical longitudinal section of the same; Fig. 3 is a section on line 3*3 of Fig. 2 looking towards the chuck and show-' ing the bit tang locked in the chuck; Fig. 4 is a view similar to Fig. showing the bit in position to be re leased; and Fig. 5 is Fig. 2.

Referring now more particularly to the drawings, the

a cross section on the line 5-5 oi numeral 1 represents the shank of an ordinary bit and 2 its angular tapered tang. v

The bit holder and extender comprises a shank 3 pro- 'vided at one end with an angular tapered tang i adapted to engage the chuck of an ordinary brace, and having its opposite end enlarged to form ahead 5which is provided with a socket 6 to receive the tang 2 of the bit 1'. The enlargement ofthe outer end of the shank 3 to form the head 5 causes the production of a shoulder 7, in rear of which is arranged an adjusting sleeve 8 which is free,

to revolve in a fixed plane about the shank 3 between said shoulder 7 and a collar 9, the latter being secured to the shank by means of a pin or equivalentfastening l0. The inner or upper end of the sleeve 8 is provided with milled portions ll to enable it to be readily grasped and turned while the outer or lower end thereof is formed with external screw threads 12 to engage internal screw threads 13 on the inner end of a clamp 14 which is employed to hold the tang 2 seated in the socket 6.

The clamp 14 is in the form of a sleeve open at its inner end so that it may be applied to and removed from the extender over the head 5, and provided at its outer end with a. clamping head 15 adapted to engage the base or large end of the tang 2. As shown, the head 15 is provided with a slot lo extending transversely across the same from a point a little on one side of the center of the clamp to and through one side of the clamp, the said s ot communicating at its outer end with a notch or re cess 17 in the side wall of the clamp'ing'sleeve. In the side wall of the clamping sleeve above the notch 17 is formed a slot 18 which is provided at its inner end with an offset portion 19, thus forming in effect a keyhole slot which receives a pin or project ion 20 extending from the head 5. By this construction clamping sleeve 14 is permitted to move longitudinally on the head 5 and to turn or rotate to a limited extent to vary the pos'ition of the slot 16 relative to the axis of the tool to effect a release of the tang 2 and the clamping of the same ,by head 15. As the adjusting sleeve 8, while free to retate, is held from longitudinal movement between the shoulder 7 and collar 9, it will be seen that when this sleeve is turned in one direction or the other it will adjust the clamping sleeve 14 of the chuck longitudinally .in and out on the head 5, which motion will be converted at the limit of the movement of said clamping I sleeve into a partial rotary movement by the action of :the pin 20 on the walls of the slot 18 and its offset 19.

' Fig. 2 shows the tang 2 of the bit 1 seated in the socket, G and held clamped therein by the head 15 of "the chuck s1eeve 14, in which operation the slot 16 occupies the position shown in Fig. 3, in which it will be seen that the walls of said slot extend at an angle to the sides of the mug and project below and across the points oi the tang, thus holding the latter from outward movement. When the sleeve 8 is turned to force the clutch sleeve 14 outward on the head 5, however, the head 15 first moves out of contact with the base of the tang 2, and as the movement of the sleeve 14 continues the head 15 will be removed suiliciontlv from the end of the head 5 to permit the lung 2 to be withdrawn from the socket U, at which time the pin 20 will have caused a rotary movement of the sleeve 1- thus bringing the slot 16 to the position shown in Fig; 4 in which the walls of said slot 16 lie in planes parallel with the sides of the tang 2 and outwardly beyond the same, thus permitting the bit'] to be withdrawn through said slot. -The purpose of the ide slot or notch 17 is to facilitate removal of the tang 2 and avoid the necessity of adjusting the sleeve l-i outward to its fullest extent, said slot admitting of the tang 2 being disengaged before it is'cntirely withdrawn from ill! slot 6 by a movementof said tang laterally or at an anglc to said slot, such movement being permitted by the reduced end oHhc long being oi less size than the outer end of the socket, whereby the tang may be easily withdrawn to'det-ru-h 1hc bit. To apply the hit it is simply necessary to adjust the clamping sleeve outwardly iu the required extent, then to insert the turn the adjusting sleeve 8 to the right to slide the clamping sleeve 14 inward on the head 5, whereupon the latter will be adjusted longitudinally on said head and at the same time turned to clamp the tang in position, as shown in Fig. 3.

The construction of the parts employed by me is such as to permit of the chuck end of the holder and extender being made of such relatively small size that the extender may follow the bit into the bore cut thereby, thus enabling deep holes to be bored with an ordinary short bit.

It will be understood that in operation the bit to be used is clamped to the holder and extender, and the latter then applied by means of its tang 4 to the brace, thus projecting the bit forward of the brace a suiticient distance to perform the operation and form the length of bore desired. Preferably, the slot 16 is disposed eccentrically to the axis of the sleeve 14 in a direction transversely of its length, in order that one of the walls of the "slot may project inwardly a greater distance thanthe other, so as to insure the engagement of the head 15 with the tang of a bit smaller than the standard size if such a bit happens to be used.

From the foregoing description, taken in connection with the accompanying drawings, the construction and mode of operation of the invention will be understood without a further extended description.

Changes in the form, proportions and minor details of construction may be made within the scope of the invention without departing from the spirit or sacrificing, any of the advantages thereof.

Having thus described the invention, what is claimed as new, is i l. in a bit extender, the combination of a shank provigiod at one nd with a hood having a sockct and forming at its point of junction with tho shank a holder. a pin projecting from the head. a clamping sleeve. surrounding the head and provided with a longitudinal slot receiving said pin and having a lateral oiisot, said sleeve being provided at its inner cud with internal screw threads and at its outer end with a head formed with a slot extending; transvorsoly across the same from a point on one side of its con- Ior to and through its opposite side, said slot communicating with a notch in the side wall of the sleeve below said longitudinal slot. a collar on the shank, and an adjusting sloevc mounted (in the shank between said collar and the stop shoulder formed by the head and provided at its outer cnd with internal threads engaging the threads of the sloevo. substantially as doscribed.

Z. .\n-oxionsion bit holdor comprising a stem having an ond sockoi and a guido pin. :1 sloevc slidable longitudinally on said socket having a partially closed free end with an opening communicating-at one side of the sleeve with a longitudinal slot therein, connections between the sleeve 41nd the stem being respectively a-threaded ongagoment and one permitting rotary without longitudinal' motion. the sleeve having a slot with a deflected portion engaging said pin whereby by the threaded engagement the sleeve may be forced longitudinally of the stem to move a tool head into the socket and by the pin and slot connection be turned to a tool holding position.

3. An extension bit holder comprising a stem having a socket to receive a bit tang. a bit clamping cap titted on said socket and provided with an end and a side opcning. an operating sleeve rotatablc on tho stein in u tixod plane and in adjustable conncction with tho cup to impart a lollgitndinal movement thereto. said connoction boin; adaplctl to permit tho cap to havo rotary movomcnt. and connocting means beiwocn tho cap and sockoi. whorob lho longitudinal niovomont of the cap produccs a rotary niovoment thcrooi to movo tho cup in and out of clumping position. 1

4. An extension bit holdor comprising a stool having a socket for the reception oi a bit tang. a clamping cap iittcd on tho sockot and having; a partially closod outor end formed with an end and a sido oponing. an opornling sioo 'o rotated in a fixod piano on tho stom and having a throndod engagement with. the cup to movo said cap longitudinally on tho socket and permit a rotary action thorooi. and coin nocting moans botwoon tho cap and sockot. \vhoroby tho longitudinal movomont of tho cap produces a rotary moroment thorcof to adjust iho cup in and out of clamping posi tion.

Ii. In a tool holdor, tho combination of :1 stom having a socket for tho rccoption oi a tool tune. a clampingcap can ricd by tho stein. said cap boing provided at its outor ond with a transvorso slot and :1 siilo slot communicating thorowith. connoclinr; moans botwoon tho stom and cap. whorohy tho cap is adapiod to hnvc a longitudinal and limited rotary movolnoni on tho s-toin to movo ii liiii) tiiitl out of clamping position. and a rotary operating, inombor on tho stoin having :uljusiablo connection with tho cap. win-rob lho laltor may bo longitudinally adjnstcd and pcriniitod to rotuto through tho action of the described connection.

6. \n oxlonsion bit holdor comprising a stom having; :1 bit rocoivins, sockol. a clamping cap having a longitudinal and rotary motion on tho socket and provided with moans oporaiivo upon rovorso movoments thorcof to clamp and roleasc a bit hold in tho socket. an operating device rovolubly mountod on tho sicm and connected with the cap to client a longitudinal inovoment thereof and permit rotaiion of the cap on oath of its longitudinal movements. and a connection between the cup and socket, whereby the ion gitudinal movement. of the cap produces a rotary movement thereof to adjust said cap into and out of clamping position.

in testimony \vhorcof. i afiix my signature in presence of two witnesses.

EDWA It I) 'i. MURRAY.

\Viinossos Ul-ll). Momnsox, War/run Mommy. 

